Stud-bolt driver



J. P. JOHNSON.

STUD BOLT DRIVER.

APPLICATION FILED APR. 12, 1920.

Patented Apr. 5,1921.

PATENT JAMES P. JOHNSON, OF CLEVELAND HEIGHTS, OHIO.

STUD-BUILT DRIVE-E.

Specification of Letters Patent.

Patented Apr. 5, 1921.

Application filed. April 12, 1920. Serial No. 373,268. h

To all whom it may concern:

Be it known that I, JAMns P. JOHNSON, a citizen of the United States, residing at Cleveland Heights, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Stud- Bolt Drivers, of which the following is a specification.

This invention relates to a device to be employed for inserting and extracting headless or stud-bolts, and it has for its object the production of a tool of this class that is simple, durable, and economical in construction, and when applied and operated, will readily and effectually perform the functions set forth without damaging the thread of the bolt.

With this as a primary object in view, the present invention consists in the novel construction, combination and arrangement of parts as hereinafter described and pointed out definitely in the appended claims, reference being had to the accompanying drawings which are made part of the specification, similar reference characters being em ployed to designate corresponding parts.

In the said drawings Figure 1 is an elevation of a manually operative tool embodying the improvements, showing a portion in section.

Fig. 2 is a plan view partially in section, and with the handle members broken away. Fig. 3 is a section on line 3-3 of Fig. 2.

Fig. 4; is an elevation of the bolt gripping member detached.

Fig. 5 is a section on line 55 of Fig. 1, and Fig. 6 is a similar section of the casing with the other elements eliminated.

Fig. 7 is a section on line 77 of Fig. 4.

Fig. 8 illustrates a modified construction, partially in vertical section, and Fig. 9 is a plan View of said modification. Flg. 10 shows the improved tool as adapted to be power driven.

An embodiment of the invention as illus trated by Figs. 1 to 7, inclusive, provides a housing member 1 having a head 1 and a depending barrel element 1". The bore 1 of the barrel 1 is of particular contour having four equilateral plane surfaces 1 and four equal intermediate circular surfaces 1. A socket member 2 is provided with a stem 2- which is fitted in the upper portion of the housing 1, as shown in Fig. 3, and a depending element 2 provided with a bore or boltsocket 2 is incased within the element ll.

Vertically disposed cavities 2 are provided in the member 2. These cavities open into the bore 2 and are uniformly arranged and provide receptacles for roller members 8, said roller members being retained therein by an annular flange 2 Ratchet connection of the member 2 with member 1 is provided as follows: T he head 1 has a segmental slot 1 therein which provides a race for the action of a pin l which is attached to the stem 2 as best shown in Fig. 2. The pin at extends through the slot 1 and is preferably provided with a manipulating element or knob 1 A spring con trolled ratchet pin 5, normally extends into the slot i and regulates the movement of the member 2 relatively to the member 1, through its coaotion with the pin i and the end walls 1 and 1 of the slot 1. Manipulating members or handles 6 are firmly attached to the head 1.

In the application of the tool, the bolt to be operated upon is enveloped in the socket 2 and the member 1 is turned to the right or left as desired. The pin 4 attached to the stem 2 is acted upon by member 1 through its engagement with said pin in the slot 1, causing the rollers 23 to bind longitudinally on the bolt, through their engagement with the plane surfaces 1 of the bore 1, and turn said bolt in the direction of rotation of the tool. When the direction of rotation is reversed the initial movement of the member 1 releases the said. member from member 2 by the resistance offered by the spring pawl 5. This allows the rollers to clear the bolt, in the spaces between said bolt and the circular surfaces 1". Further rotation of the member 1, in this direction, will cause the pin l to pass the pawl 5 and by engagement with the opposite wall of the slot 1 the member 2 is again engaged with member 1 and the bolt is turned in the reverse direction by the binding function of rollers 8. It will readily be understood that a bolt may be screwed in, or out, either by continuous rota tion of the tool in one or the other direction, or by a ratchet movement either way.

The extended bearing longitudinally, and the uniform pressure of the coacting rollers on the bolt prevents damage to the thread and also provides for positive grip and alternate release.

The modification illustrated in Figs. 8 and 9 embodies the same principles of operation as those of the preferred form. This construction provides a collar 10 attached to the stem 2 by a pin 11. The collar has a hearing in the upper circular bore 12 of the member 12, and has a knurled head 10, and a series of spring pawls 13 which act in pockets on the top of member 12. Otherwise the construction is the same as that of the preferred embodiment, including a plurality of roller members which coact with the member 2 and member 12 to grip and release tne bolt, the contour of the bore in the lower portion of member 12 being the same as the contour of the bore 1 of the preferred form.

Fig. 10 shows the tool provided with a tapered stem 6 connected with the member 1, for attachment to a power driven rotating mechanism. The construction, combina* tion and arrangement of the parts oi": the power driven tool are the same as that above described, except that the actuating stem 6 is substituted for the handles 6.

What I claim and desire to secure by Letters Patent is.

l. A stud-bolt driver comprising a rotatable body member provided with a barrel, a socket member adapted to rece' e the bolt to be acted upon, operative within said body member, said socket member being provided with cavities which open into the socket; and means coacting with the body memher and the socket member through the opening in the cavities for gripping the bolt when the device is rotated.

2. A stud-bolt driver comprising a rotatable body member provided with a barrel element, a socket member within the body member, adapted to receive the bolt to be acted upon, said socket member being pro vided with cavities having openings into the socket, and ratchet clutch means coacting with the body member and the socket member for directly gripping the bolt when the device is rotated.

3. A stud-bolt driver comprising a rotatable body member provided with a barrel element, a socket member within the body member, adapted to receive the bolt to be acted upon, said socket member being providedwith cavities having openings into the socket, ratchet means connecting the body member and the socket member, and

roller bearing clutch means coacting with rollers mounted in the cavities provided in the socket member, and coacting with the barrel member and the socket in the socket member, for grippingthe bolt when the de vice is rotated. V

5. In a stud-bolt driver, the combination oi a rotatable body member provided with a head and a depending barrel element, a bolt socket member provided with a stem that oscillates in the head of the body member, anda socket element adapted to receive the bolt to be acted upon, said socket element confined within the bore of the barrel element, means for retarding the oscillation of the socket member, a plurality of rollers confined and operative in longitudinal cavities provided in the socket element, adapted to bear on the interior wall or the barrel element and on the bolt when the device is rotated thereby gripping the bolt.

In testimony whereof I my signature.

JAMES P. JOHNSON.

means connecting the barrel 7 

